After the PC release, you should have no problem upgrading your videos, quality speaking:

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The overall game will follow the same story as the console version, tracking protagonist Niko Bellic as he descends further into Liberty City's underworld. The nice thing about the PC version is the game will constantly be recording what's going on. So if you pull off a particularly epic car crash or string of kills, you can hit a key to get the game to pull up the last 30 seconds of gameplay either in single or multiplayer modes.

From there it's possible to edit the footage, adding filters, and fades and cut it up wherever you want. You can then take those videos and mash them together in the montage editor, then upload it to the Rockstar Social Club so the community can check it out.